JPMorgan, Bank of America and Citigroup would become the world’s three largest banks and Wells Fargo the sixth-biggest. Their combined assets of $14.7 trillion would equal 93 percent of U.S. gross domestic product last year, the data show. Total assets of the country’s banking system would be 170 percent of economic output, still lower than 326 percent for Germany.

U.S. accounting rules for netting derivatives allow banks to erase about $4 trillion in assets, the data show. The lenders also can remove from their books most mortgages they package into securities, trimming an additional $3 trillion.